#include <time.h>
#include <stdio.h>
#include <stdlib.h>

#define N 30000

int main()
{
    float x,y;
    int c = 0,d = 0;
    //randomize();
    while(c++<=N)
    {
        x = random()%101;
        y = random()%101;
        if(x*x + y*y<=10000)
        d++;
    }
    printf("pi=%f\n",4.*d/N);
}